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Aug 1st 2017, 08:05 PM   #1
 CodeBlue's Avatar
  Jan 2016
  Seattle, WA

  KTM 990 Adventure
KTM electrical question - 5v draw?

I'm embarking on a side project to build a satellite-communicator/pseudo-black box for my KTM, using a Raspberry Pi computer. First, though, I need to find a way to draw a steady 5v current from the bike. It'd be the same as charging a phone, so I might be able to use the same 10v fuse that feeds my GPS unit, but I'd really rather ask people who know before I extracting magic blue smoke from my daily driver and/or an array of gadgets.

How would I go about doing this? Any suggestions? I can do the programming, but I'm no electrical engineer.

For a summary of what I'm aiming for once this is done:
Aug 1st 2017, 09:07 PM   #2
 MikeMikeMike's Avatar
  Feb 2016

You could use something like this. But there is probably something smaller you could add on to a Raspberry Pi or maybe that board itself which could also function as a DC-DC converter.

Adjustable DC-DC Power Converter 1-12V - RobotShop
Aug 1st 2017, 09:11 PM   #3
 MikeMikeMike's Avatar
  Feb 2016

Just googled it and found a better solution. Thread is here.

Product they recommend is here:

Adjustable 5.5V-28V Input, 5/6V Output 3A UBEC Voltage Regulator - RobotShop
Aug 2nd 2017, 06:43 AM   #4
 HalcyonSon's Avatar
  Apr 2016

You can check Mouser, Allied, and Newark for parts that you can breadboard or solder directly to a custom PCB. Their prices are usually not bad compared to the massive selection, but shipping for a single component will bite you.

I miss the days of RadioShack on the corner or at the mall carrying components. It's all cell phones and gimmicky Star Wars quadrotors now.
Aug 2nd 2017, 07:42 AM   #5
 DocB's Avatar
  Feb 2016
  Poulsbo, WA

  Aprilia RSV Mille, CB77 (AMA Nat'l landspeed record holder), CB750K, CB750F
You haven't said how much current your Raspberry Pi draws. That is a factor in deciding what to use. If the current draw of the model you are considering is not too big (like under 1.5A) a USB charging port adapted to connect to the Raspberry Pi would probably be fine. Wallyworld has one. Over 1.5A you will need something a little more robust.
Aug 2nd 2017, 09:20 AM   #6
 coastrider's Avatar
  Jan 2016
  Oregon Coast

  2017 BMW R1200RT
I have used a couple of the r-pie boards and find them pretty nice. Most recently set one up to do some periodic ping tests when chasing a cable modem provider problem.

Data sheet I find says that the model 3 recommends a 2.5 amp supply and allows 1.2 amps max draw on the USB port. I have seen quotes of 230 mA for a bare model 3 board at idle and 400 mA when active. Other models have other power requirements.

Is your plan to upload location information? Via satellite? I would be interested to know the method planned to do that.
Aug 2nd 2017, 10:18 AM   #7
 CodeBlue's Avatar
  Jan 2016
  Seattle, WA

  KTM 990 Adventure
Thanks for the information, everyone! I'm just starting out with this, and this is one of the more intimidating issues for me since I don't really understand electricity all that well... Your answers will make this step significantly more manageable. I really appreciate it. It's unclear what the final power draw will be, so I'm sure this will be the first of many power draw increases as I add an accelerometer, communicator, and possibly a dashcam of some sort.

As for how I plan to upload location information: Satellite communication with RockBLOCK | Makersnake

In theory I should be able to store data in the Pi if there's no way to send consistent, scheduled packets of data through the satellite. The baseline goal is to get it set up so that if I crash, or the bike catches fire, it would send an automatic message to my wife and parents to let them know where I am (with coordinates) so they can call emergency services.
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